任意预设精度小数(几乎类似于 BigDecimal) [英] Arbitrary pre-set precision decimals (Almost like BigDecimal)

问题描述

我正在寻找一个 Java 类，它可以保存一个具有任意预设精度的十进制值.类 BigDecimal 看起来是一个很好的起点，但我希望能够将小数的大小限制为最终用户决定的任何内容.从字面上看，最终用户会指定一个以 10 为基数的范围，我会分配足够的字节来表示该范围内的任何数字.

I'm looking to have a java class that will hold a decimal value with an arbitrary pre-set precision. The class BigDecimal looks to be a good candidate as a starting point, but I want to able to limit the size of the decimal to whatever an end user decides. Literally speaking, the end user would specify a range in base 10 and I would allocate enough bytes to represent any number in that range.

我想拥有一个扩展 BigDecimal 的类.在本课程中，我将添加在预设范围内模拟小数所需的功能.

I was thinking of having a class that extends BigDecimal. In this class I would add the functions necessary to mimic a decimal within a pre-set range.

我向社区提出的问题是:是否有任何图书馆已经这样做了?
扩展 BigDecimal 是否合理?

My questions to the community are: Are there any libraries that already do this?
Would extending BigDecimal be a reasonable thing to do?

推荐答案

我建议你在你提出的建议之间采取一种中间方式:

I would suggest you an intermediate way in between the proposals you made:

Apfloat 库是一个很好的尝试方式，请查看 API 文档.
Apcomplex 是一个包装类，例如一个 BigDecimal.

The Apfloat library is a good way to try with, check out the API docs.
Apcomplex is a wrapper class for e.g. a BigDecimal.

因此，在这里，您将有很大的自由来覆盖和增强仅应用此类的新方法.

So here you would have a big freedom on overriding and enhancing new methods just applying this class.

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